diff options
Diffstat (limited to 'sysdeps/i386/selectbits.h')
| -rw-r--r-- | sysdeps/i386/selectbits.h | 42 |
1 files changed, 26 insertions, 16 deletions
diff --git a/sysdeps/i386/selectbits.h b/sysdeps/i386/selectbits.h index 973ecad58e..9855e9308f 100644 --- a/sysdeps/i386/selectbits.h +++ b/sysdeps/i386/selectbits.h @@ -21,36 +21,46 @@ #if defined __GNUC__ && __GNUC__ >= 2 -#define __FD_ZERO(fdsetp) \ +# define __FD_ZERO(fdsetp) \ __asm__ __volatile__ ("cld ; rep ; stosl" \ : "=m" (*(__fd_set *) (fdsetp)) \ : "a" (0), "c" (sizeof (__fd_set) \ / sizeof (__fd_mask)), \ "D" ((__fd_set *) (fdsetp)) \ :"cx","di") -#define __FD_SET(fd, fdsetp) \ +# define __FD_SET(fd, fdsetp) \ __asm__ __volatile__ ("btsl %1,%0" \ - : "=m" (*(__fd_set *) (fdsetp)) \ - : "r" ((int) (fd))) -#define __FD_CLR(fd, fdsetp) \ + : "=m" (((__fd_set *) (fdsetp))[__FDELT (fd)]) \ + : "r" (((int) (fd)) % __NFDBITS) \ + : "cc") +# define __FD_CLR(fd, fdsetp) \ __asm__ __volatile__ ("btrl %1,%0" \ - : "=m" (*(__fd_set *) (fdsetp)) \ - : "r" ((int) (fd))) -#define __FD_ISSET(fd, fdsetp) \ + : "=m" (((__fd_set *) (fdsetp))[__FDELT (fd)]) \ + : "r" (((int) (fd)) % __NFDBITS) \ + : "cc") +# define __FD_ISSET(fd, fdsetp) \ (__extension__ \ - ({unsigned char __result; \ - __asm__ __volatile__ ("btl %1,%2 ; setb %0" \ + ({unsigned int __result; \ + __asm__ __volatile__ ("btl %1,%2 ; setcb %b0; andl $1,%0" \ : "=q" (__result) \ - : "r" ((int) (fd)), "m" (*(__fd_set *) (fdsetp))); \ + : "r" (((int) (fd)) % __NFDBITS), \ + "m" (((__fd_set *) (fdsetp))[__FDELT (fd)]) \ + : "cc"); \ __result; })) #else /* ! GNU CC */ -#define __FD_ZERO(set) \ - ((void) memset ((__ptr_t) (set), 0, sizeof (fd_set))) -#define __FD_SET(d, set) ((set)->fds_bits[__FDELT(d)] |= __FDMASK(d)) -#define __FD_CLR(d, set) ((set)->fds_bits[__FDELT(d)] &= ~__FDMASK(d)) -#define __FD_ISSET(d, set) ((set)->fds_bits[__FDELT(d)] & __FDMASK(d)) +/* We don't use `memset' because this would require a prototype and + the array isn't too big. */ +# define __FD_ZERO(set) \ + do { \ + unsigned int __i; \ + for (__i = 0; __i < sizeof (__fd_set) / sizeof (__fd_mask); ++__i) \ + ((__fd_mask *) set)[__i] = 0; \ + } while (0) +# define __FD_SET(d, set) ((set)->fds_bits[__FDELT(d)] |= __FDMASK(d)) +# define __FD_CLR(d, set) ((set)->fds_bits[__FDELT(d)] &= ~__FDMASK(d)) +# define __FD_ISSET(d, set) ((set)->fds_bits[__FDELT(d)] & __FDMASK(d)) #endif /* GNU CC */ |